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A time difference ultrasonic flow measurement method and device

A flow measurement and ultrasonic technology, applied in the field of transit-time ultrasonic flow measurement method and device, can solve problems such as large measurement errors, and achieve the effects of improved measurement results, theoretical reliability, and simple device

Inactive Publication Date: 2018-04-03
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the transit-time ultrasonic flowmeter assumes that the fluid flow velocity of the ultrasonic beam on the propagation path is uniform, but in fact the velocity distribution of the fluid is related to the flow state, and the velocity distribution on the cross-section of the circular tube is a rotating parabola in laminar flow , the velocity distribution on the cross-section of the circular tube is boss-shaped when the flow is turbulent, so it will inevitably cause a large measurement error

Method used

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  • A time difference ultrasonic flow measurement method and device
  • A time difference ultrasonic flow measurement method and device
  • A time difference ultrasonic flow measurement method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the flow measurement method is as follows:

[0036] The propagation time difference of the ultrasonic beam along the downstream and upstream is:

[0037]

[0038] When the measured flow is laminar flow, the velocity distribution of laminar flow is substituted into formula (1), and the integrated time difference is:

[0039]

[0040] Among them, R is the radius of the pipeline under test; u m is the maximum flow velocity of the pipe axis; θ is the angle between the ultrasonic beam and the fluid flow direction; c is the propagation speed of the ultrasonic wave in the measured fluid;

[0041] Then the flow in laminar flow is:

[0042]

[0043] Among them, for Z-type, V-type and W-type three different installation methods, the coefficient K is 1, 2 and 4 respectively;

[0044] Regardless of the inhomogeneity of the velocity distribution, the ultrasonic propagation time difference is calculated according to the average velocity, then the measured fl...

Embodiment 2

[0092] Example 2: figure 2 Among them, the ultrasonic sensor is arranged in a V shape, the downstream ultrasonic sensor 4 is on the same side as the upstream ultrasonic sensor 5, and the downstream ultrasonic sensor 4 is located on the lower side of the upstream ultrasonic sensor 5; the others are the same as in Embodiment 1.

Embodiment 3

[0093] Example 3: image 3 It is a W-shaped layout structure diagram of the ultrasonic sensor of the present invention. The downstream ultrasonic sensor 4 is on the same side as the upstream ultrasonic sensor 5, and the downstream ultrasonic sensor 4 is located two V-shaped distances below the upstream ultrasonic sensor 5; the others are the same as in Embodiment 1.

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Abstract

A time-varying ultrasonic flow measurement method and device, which belongs to a flow measurement method and device. The speed distribution of the actual fluid is related to the flow state, the velocity distribution on the cross-section of the circular tube during laminar flow is a rotating parabolic type, and the velocity distribution on the cross-section of the circular tube during turbulence is a boss type; the ultrasonic wave is loaded with the information of the fluid flow rate when it propagates in the flowing fluid, and the flow rate of the fluid can be detected by the ultrasonic wave received, and converted into flow; the time difference ultrasonic flowmeter is converted into flow by measuring the time difference between the ultrasonic beam in the process of downstream and countercurrent propagation. When the flow velocity on the ultrasonic propagation path is assumed to be uniform will produce a large measurement error, the flow rate obtained according to the method of the present invention is much more accurate. Advantages: The method is theoretically reliable, the device is simple, the method is reliable, the implementation is convenient, the measurement accuracy is high, the measurement result can be improved by 5% to 33%, and it is suitable for all ultrasonic flowmeters that measure the flow based on the propagation time difference.

Description

technical field [0001] The invention relates to a flow measurement method and device, in particular to a time-difference ultrasonic flow measurement method and device. Background technique [0002] The time difference method ultrasonic flowmeter is to determine the flow velocity of the measured fluid by measuring the propagation time difference of the ultrasonic wave with the upstream and downstream. When the ultrasonic wave propagates in the flowing fluid, it carries the information of the fluid flow rate. The flow velocity of the fluid is detected and converted into a flow rate. At present, the transit-time ultrasonic flowmeter assumes that the fluid flow velocity of the ultrasonic beam on the propagation path is uniform, but in fact the velocity distribution of the fluid is related to the flow state, and the velocity distribution on the cross-section of the circular tube is a rotating parabola in laminar flow , the velocity distribution on the cross-section of the circul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/66
CPCG01F1/66
Inventor 郭楚文王信用王凤超
Owner CHINA UNIV OF MINING & TECH